Update README.md

fix a error description of Endpoint in chapter "Adding a Dependent Job"
Updated travis config.
Fix build, update pom.
Make ZK tests less flaky.
Add build status to README.
Added `runAsUser` job parameter.
Swap ganglia for graphite reporter.
Update CONFIG.md.
Also set user when executor is supplied.
Clean up pom.
Drop errorsSinceLastSuccess from chronos-sync fields.